Concrete-mixer.



.CHRISTOPHER W. LEYALLEY, 0F MILWAUKEE, WISCONSIN.

CONCRETE-MIXER.

January 6, 1912.

To all whom it may concern:

Be it known that I, CHRISTOPHER W. Ln

VALLEY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Concrete-Mixers, of which the following is a specification.

This case is a division of my application No. 461,891, filed November 10, 1908.

,The invention herein presented relates to machines for mixing materials and has been devised with especial reference to the inixing of concrete.

It has for its object to improve the form of the mixing drum of such a machine so as to increase the mixing capacity thereof and at the same time insure `that the ingredients which enter into the mixture beine' produced shall be'conimingled rapidly an( .in an exceedingly advantageous manner.

In they accompanying drawings: Figure 1 is an external elevation of the drum or mixing receptacle of a concrete mixing machinel constructed according to my invention. Fig. 2 is a central longitudinal vertical section of a concrete mixer embodying my inidrum. The drum is formed with central .A arranged to axial openings, that at 9 being` the one through which the materials to be mixed are fed into the drum, and that at 10 the one through which the finally mixed concrete or other material being treated is discharged.

A longitudinal section of the drum, designated 1l, adjacent to the feed end thereof and referably extending about half the length) of the drum or a little more, is cylindrical in shape and provided with internal mixing and advancing flights 12, these being carry upward and then let fall Specification of Letters Patent.

Original application filed November 10, 190B, Serial No. 461,891.

Serial No. 669,841.

Patented May 21, 1912.

Divided and this application led lower segment of this section, 13, `of the drum Where the concrete or other material being mixed tends to collect. I prefer that thatportion of the drum between the cylindrical section .11 and the bulge 13, which I have designated 13, should curve outwardly so as to form a concave interior surface over which the material being mixed can easily slide with a somewhat accelerated speed in passing from the cylindrical section 11, to the substantially cylindrical part 13" of the bulge, where it may be retained as long as desired to insure proper mixing or4 until the attendant is ready to discharge the machine. By thus constructing the drum there is no tendency for the concrete material to collect and become hardened in passing into the enlarged or bulge section, thus clogging the machine. This form of drum insures a thorough preliminary mixing of the in vredients delivered to the machine, inthe cy 'ndrical part or section thereof, 11, where however the material is not long retained, but is advanced, more or lerapidly, according to the inclination at which theiights 12 are set.. On the other hand the enlarged recurving bulging portion 13 of the in' f drum, constitutes a sort of receptacle in wgich the concrete mass collects and. receives its finall mixing, and where it-is retained until itis desired to discharge it. This section of the drum is provided with suitable internal iiights or mixing blades 15 which, as shown in the drawings aiid owing to the enlarged and bulging shape of this section ofthe drum, may be of greater depth than the flights 12, to insure a correspondingly increased lifting action.

lt will be seen, by reference to Fig. 2 of the drawings, that the end wall 1i extends so far inward or tward the axis of revolution rials, to give of the drum, that the discliaihe opening; therein olf a diameter cuiisidcii'ablv than the internal diameter the drum. This end 'wall i operates to retain the mass ci: material f ns; cpan-ated uprn Within the buiging; e non oi the drinn notwithstanding the 'l'uct iliat 'the lifting and adinncinp; blades with which the drinn is prm'idcd and also the Y inclined Wall i3 cf the drum, tend to force the material Ward the rear end of the machine; and also operates in a large measure to prevent the material splashing` outol the drum, While beingy retained and mixed in the said bull,n ing` section.

lt often happens in mixing concrete that the `inggredients have not been properly mixed when they arrive at the dischargerend of the drum, or that the concrete When it arrives at this part of the mixer is not in the desired physical condition for use, being, for instance, either too 'thin or too thick. drum of 'the construction just described having a bulging section near its discharge end7 when combined with discharging devices that in their operation are under the control of an attendant, permits the retention of the mass of concrete 'Within die drum a suftiient length of t 'ne te elcct the desired mi ing oi the ents; and wlmi a drum oli this construction. is used in connection with adjustable means arranged to return the con crete 'that lifted by the flights l5 toward the head er iced end o the druml it er: tirely feasible vio ccllect in the rear portion of the drum close to `the discharge opening, u. considerable mass' ci ihe concrete which may be observed and tested so that if desired it can be returned toward the forward part of the drinn. `for rcinixing7 with added mateit the desired consistency.

The drum constructed as described is pref erably 'formed of a plurality of sections. l have represented the sections .ll and 'i3 being separately .ien-med and united by rivets l. 'lhe iront section ll is preferably ot sheet steel.

28 designates stationary discharge chute lextending 'through the opening 'l0 into the drum. p

lt will be undcrs'toed that the [lights l5, when the drum is run at the proper working speed, lift the concret mixture and let it fall upon the inner end of the delivery chute which then conducts it out of the machine. With this chute l preferably combine an adjustable gate or cut-oi? adapted, when in one position, :is that represented in dotted lines in Pig. fl, to prevent the material lii- .d and .xargged hy "he digg of Alli.

of any portion et l l i memes rial to pass directly to the chute and out of the machine.

There are numercus forms of gates or cutwell linmvn in the art to which my invention belongs 'that may be used in connection with the drum herein described. That which l have illustrated is cf novel construction and arrangement and forms .the subject-matter olf claims presented in my afcresaid application of which this case is a division. I do not deem it necessary to describe the said gate or cutfo in detail, it only be-L ing necessary, for the purposes of this case, that it should be adjustable and operate in the manner already described.

The drum described is of. great and at 'the same timefdoes not Wear out strength and deteriorate rapidly eyen when operated to its full capacity, which, as has been demonstrated, is greater than that of any machine,

olf which l have knowledge, of similar size.

What l claim is:

1. ln a machine for mixing concrete, a rotatable drinn having a substantially cylindrical portion Ente which 'the material is irst delivered end Where the preliminary mixing takes place, and a Asecond section near the delivery end of the drum having curved circumferential and an end Wall in which is an axially disposed discharge opening, the diameter of which openingr is less than the interior diameter or" any portion of the drum, the said Second section of lhe drinn being adapted tore ceive 'ally an. entire charge of the n'citerial und retain it during the final mixing thereof?. y

Si, ln e, machine for mixing concrete, a rotatable mixing drum having aiiially disposed openings in its end Walls, and oomprising a cylindrical section Where the material is first delivered and mixed, and anotlnzr, circumfcrentially bulging, section near the delivery end of the drum for the i'uiul mixing of the material and formed with a substantially cylindrical part near its end wall and an outwardly curved part torming an inner ciineave surface over wiwi h the material being mixed passes, located, be tween the said cylindrical part of theli'ir'st mentioned section and the cylindrical part of the lullgre section the' axial opening` at the f lischarge-end oLt' the drum being of less di ainotcr than the interior diameter of any portion of the drum, and mixing and lifting flights carried by each of the sections ol the drinn. l

3. ln a machine for mixing; concrete, a, ro tel'able mixing; drum having an axially disposed opening in its discharge end Wall ot a diunwtrr less than the interior diameter of Lion el? the drum, the portion ci the 'lo the discharge end being ferrulally bulging constrution bulging side Walls,

and larger in iam-eter" than the ortions of the drum toward the feed en whereby Athere is formed a Collecting pocket or section in 'which an entire charge of .mixed concrete may be retained befor final dischm' e, in combination'with adjustable dische devises unr'im the contreof the operator, m'mngecil to deiver material from th drum or return it toward the` front of thel drum'for further mixing, accordingly 10 CLIFFORD F. MESSINGER, J. M. Tnvon. 

